I have a iPhone 3GS currently running iOS 6.0.1 and I want to downgrade it to iOS 5.0 or 5.1 so that I can jailbreak it. The problem is however that I don't have SHSH blobs for iOS 5.0 nor for 5.1, but I do for iOS 4.3.3 . I have recently been able to downgrade to 4.3.3 but I wasn't able to then follow on and do an upgrade to iOS 5.

Is this at all possible? Upgrading 4.3.3 to 5.0 without SHSH blobs for 5.0 ?

Please Help